As of 2013, little analysis of this paraphilia has been reported in medical literature. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver videos gays may receive nude milfs pleasure from external anal stimulation. A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. The term Asiaphile is sometimes used to describe the same phenomenon as is yellow fever . The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. These scenes may either have the cameraman directly engaging in sex or merely filming others having sex. Targets the male audience, but is much less popular than Yaoi. In the context of consensual erotic activities, sadism and masochism are not strictly accurate terms; there is a significant difference from the medical or psychological usage of both terms. A female dominant in a master/slave relationship is often termed a Mistress, not to be confused with the colloquial usage of mistress as a kept sexual 3d hentai partner without a similarly formalized power relationship. A variant of A2M is ATOM where a performer inserts his penis directly from one recipient anus into a second recipient mouth. Group sex is sexual behavior involving more than two participants. Cuckold fetish pornography that involves a cuckolded husband. There is no singular or archetypical behavior; therefore, a wide range of thought patterns and behaviors exist, but all tends to be a harmless and efficacious release from some kind of pressure. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. Comic books often featured characters being tied up and tying others up, particularly in damsel in distress plots. Depictions of male and female masturbation are common in pornography, including gay pornography.